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Fix npm run build Exit Code 1: Common Causes and Solutions - Troubleshooting Nginx Backend Connection Refused-Cloudflare 521 Error During Setup – How to Resolve

2026-07-28 14:22:09
Fix npm run build Exit Code 1: Common Causes and Solutions - Troubleshooting Nginx Backend Connection Refused-Cloudflare 521 Error During Setup – How to Resolve

Result check

  • Keep one change per test run so you know which step helped.
  • Undo temporary changes after the issue is confirmed.

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